Abstract
City metro tunnels are usually constructed as twin-parallel tunnels and their adjacent construction may lead to surface deformation, affecting the surface environment and the safety of the tunnels. Due to its strong dispersion, sandy cobble strata can be easily disturbed by shield tunneling. Based on the project of the Chengdu Metro Line 1, field and model tests were carried out to study the surface settlement caused by shield tunneling in sandy cobble strata by measuring surface settlement curves, ground loss ratios and construction influence zones. The discrete element method (DEM) was used to study the factors affecting the formation of ground arches in sandy cobble strata at the microscopic level. Results show that the shape of the surface settlement curve in sandy cobble strata is different from that in soft soil. The buried depth and clear spacing of the two tunnels had a significant impact on the formation of ground arches.
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References
Chen, S.L., Li, G.W., Gui, M.W., 2009. Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel. Journal of Zhejiang University-SCIENCE A, 10(11):1581–1588. [doi:10.1631/jzus.A0920040]
Cundall, P.A., 1971. A Computer Model for Simulating Progressive Large Scale Movements in Blocky Rock System. Proceedings of International Symposium on Rock Mechanics, Rock Fracture, Nancy, France, p.2–8.
Cundall, P.A., Strack, O.D.L., 1979. A discrete numerical model for granular assemblies. Geotechnique, 29(1): 47–65. [doi:10.1680/geot.1979.29.1.47]
Lee, K.M., Rowe, R.K., Lo, K.Y., 1992. Subsidence owing to tunnelling I: estimating the gap parameter. Canadian Geotechnical Journal, 29(6):929–940. [doi:10.1139/t92-104]
Liu, J.H., Hou, X.Y., 1991. Shield Tunelling Method. China Railway Publishing House, Beijing, p.329–332 (in Chinese).
Loganathan, N., Poulos, H.G., 1998. Analytical prediction for tunneling induced ground movements in clays. Journal of Geotechnical and Geoenvironmental Engineering, 124(9):846–856. [doi:10.1061/(ASCE)1090-0241(1998)124:9(846)]
Lo, K.Y., Ng, R.M.C., Rowe, R.K., 1984. Predicting Settlement due to Tunnelling in Clays. Tunnelling in Soil and Rock, American Society of Civil Engineers, Geotech III Conference, Atlanta, USA, p.46–76.
Mair, R.J., Taylor, R.N., 1997. Theme Lecture: Bored Tunneling in the Urban Environment. 14th International Conference on Soil Mechanics and Foundation Engineering, Rotterdam, p.2353–2358.
O’Reilly, M.P., New, B.M., 1982. Settlements above Tunnels in the UK: Their Magnitude and Prediction. Proceedings of Tunnelling Symposium, London, p.173–181.
Peck, R.B., 1969. Deep Excavations and Tunnelling in Soft Ground. 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, Mexico, p.225–290.
Rowe, R.K., Lo, K.Y., Kack, G.J., 1983. A method of estimating surface settlement above tunnels constructed in soft ground. Canadian Geotechnical Journal, 20(1):11–22. [doi:10.1139/t83-002]
Itasca Consulting Group, 2004. PFC2D (Particle Flow Code in 2 Dimensions), Version 3.1. User’s Manual. Minneapolis.
Sagaseta, C., 1987. Analysis of undrained soil deformation due to ground loss. Geotechnique, 37(3):301–320. [doi:10.1680/geot.1987.37.3.301]
Sagaseta, C., 1988. Discussion on’ Analysis of undrained soil deformation due to ground loss’ by C. Sagaseta. Getechnique, 38(4):647–649. [doi:10.1680/geot.1988.38.4.647]
Uriel, A.O., Sagaseta, C., 1989. Selection of Design Parameters for Underground Construction. 12th International Conference on Soil Mechanics and Foundation Engineering. Rio de Janeiro, Balkema, p.2251–2551.
Verruijt, A., Booker, J.R., 1996. Surface settlements due to deformation of a tunnel in an elastic half plane. Getechnique, 46(4):753–756. [doi:10.1680/geot.1996.46.4.753]
Wei, G., 2007. Prediction of surface settlement induced by ground loss during shield tunneling construction. Rock and Soil Mechanics, 28(11):2375–2379 (in Chinese).
Wei, G., 2009a. Prediction of ground deformation induced by shield tunneling construction. Chinese Journal of Rock Mechanics and Engineering, 28(2):418–424 (in Chinese).
Wei, G., 2009b. Study on calculation for width parameter of surface settlement trough induced by shield tunnel. Industrial Construction, 39(12):74–79 (in Chinese).
Wei, G., 2010. Selection and distribution of ground loss ratio induced by shield tunnel construction. Chinese Journal of Geotechnical Engineering, 32(9):1354–1361 (in Chinese).
Zhou, J., Ci, Y.W., Ci, Y., Xu, J.P., 2000. Simulation of biaxial test on sand by particle flow and code. Chinese Journal of Geotechnical Engineering, 22(6):701–704 (in Chinese).
Zhou, J., Su, Y., Ci, Y., 2006. Simulation of soil properties by particle flow code. Chinese Journal of Geotechnical Engineering, 28(3):390–396 (in Chinese).
Zhou, J., Kong, X.L., Ju, Q.H., Li, Y.Q., 2007. Mesoscopical study on interface between geosynthetics and soil. Chinese Journal of Rock Mechanics and Engineering, 26(1): 3196–3202 (in Chinese).
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Project supported by the National Basic Research (973) Program of China (No. 2010CB732105), and the National Natural Science Foundation of China (Nos. 50908193, 50925830, and 51208432).
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He, C., Feng, K., Fang, Y. et al. Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata. J. Zhejiang Univ. Sci. A 13, 858–869 (2012). https://doi.org/10.1631/jzus.A12ISGT6
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DOI: https://doi.org/10.1631/jzus.A12ISGT6
Key words
- Twin-parallel shield tunneling
- Surface settlement
- Ground loss
- Field test
- Discrete element method (DEM)
- Model test